+ /* do the real work */
+ vsnprintf(string, len + 1, fmt, ap);
+
+ return string;
+}
+
+char *alloc_printf(const char *format, ...)
+{
+ char *string;
+ va_list ap;
+ va_start(ap, format);
+ string = alloc_vprintf(format, ap);
+ va_end(ap);
+ return string;
+}
+
+/* Code must return to the server loop before 1000ms has returned or invoke
+ * this function.
+ *
+ * The GDB connection will time out if it spends >2000ms and you'll get nasty
+ * error messages from GDB:
+ *
+ * Ignoring packet error, continuing...
+ * Reply contains invalid hex digit 116
+ *
+ * While it is possible use "set remotetimeout" to more than the default 2000ms
+ * in GDB, OpenOCD guarantees that it sends keep-alive packages on the
+ * GDB protocol and it is a bug in OpenOCD not to either return to the server
+ * loop or invoke keep_alive() every 1000ms.
+ *
+ * This function will send a keep alive packet if >500ms has passed since last time
+ * it was invoked.
+ *
+ * Note that this function can be invoked often, so it needs to be relatively
+ * fast when invoked more often than every 500ms.
+ *
+ */
+void keep_alive()
+{
+ current_time = timeval_ms();
+ if (current_time-last_time > 1000)
+ {
+ extern int gdb_actual_connections;
+
+ if (gdb_actual_connections)
+ LOG_WARNING("keep_alive() was not invoked in the "
+ "1000ms timelimit. GDB alive packet not "
+ "sent! (%lld). Workaround: increase "
+ "\"set remotetimeout\" in GDB",
+ current_time-last_time);
+ else
+ LOG_DEBUG("keep_alive() was not invoked in the "
+ "1000ms timelimit (%lld). This may cause "
+ "trouble with GDB connections.",
+ current_time-last_time);
+ }
+ if (current_time-last_time > 500)